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SDS-PAGE patterns of L. acidophilus ATCC4356 S-layer protein digested by SIF, FaSSIF and FeSSIF. M: molecular weight marker, Lane 1: Native S-layer protein, lanes 2, 3: S-layer protein digested by SIF at time = 0, 240 min. lanes 4, 5: S-layer protein digested by FaSSIF at time = 0, 240 min. lanes 6, 7: S-layer protein digested by FeSSIF at time = 0, 240 min.
